Patent US3852124A successfully refreshed from Google Patents.
US3852124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duplex sealing process
Assignee: Lanteris Space LLC
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Filing: 1972-09-22
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Granted: 1974-12-03
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Expires: 1992-09-22
Abstract
Abstract An anodized aluminum coating is sealed by a duplex process that comprises immersing the coating in a solution containing a divalent metal cation such as iron, cobalt or nickel followed by immersing the coating in a solution containing a multivalent anion such as phosphate, silicate, molybdate or chromate. The resulting seal imparts greatly improved corrosion resistance to the coating.
Inventors
- 👤 W Fassell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:01
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/18; C25D11/24; C25D11/246
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
115 words
A PROCESS FOR IMPROVING THE CORROSION RESISTANCE OF AN ANODIZED ALUMINUM COATING OF AN ALUMINUM BASED ARTICLE COMPRISING: A. CONTACTING SAID ANODIZED COATING WITH A FIRST AQUEOUS SOLUTION OF SALT SELECTED FROM THE GROUP CONSISTING OF ACETATES, PROPIONATES, SULPHATES, CHLORIDES, BROMIDES, IODIDES AND NITRATES, WHICH SALT DISASSOCIATES IN WATER TO FORM A DIVALENT CATION SELECTED FROM THE GROUP CONSISTING OF IRON, COBALT, NICKEL, LEAD, MAGNESIUM, ZINC, CADMIUM, BARIUM, CALCIUM, COPPER, MANGANESE, STRONTIUM AND TIN; B. RINSING SAID ANODIZED COATING; AND C. CONTACTING SAID ANODIZED COATING WITH A SECOND AQUEOUS SOLUTION OF A SODIUM, POTASSIUM OR AMMONIUM SALT WHICH DISASSOCIATES IN WATER TO FORM AN ANION SELECTED FROM MOLYBDATE, ACID PHOSPHATE, CHROMATE, DICHROMATE, SILICATE AND CHLORATE.
Claim 2
Dependent Claim
115 words
A PROCESS FOR IMPROVING THE CORROSION RESISTANCE OF AN ANODIZED ALUMINUM COATING OF AN ALUMINUM BASED ARTICLE COMPRISING: A. CONTACTING SAID ANODIZED COATING WITH A FIRST AQUEOUS SOLUTION OF SALT SELECTED FROM THE GROUP CONSISTING OF ACETATES, PROPIONATES, SULPHATES, CHLORIDES, BROMIDES, IODIDES AND NITRATES, WHICH SALT DISASSOCIATES IN WATER TO FORM A DIVALENT CATION SELECTED FROM THE GROUP CONSISTING OF IRON, COBALT, NICKEL, LEAD, MAGNESIUM, ZINC, CADMIUM, BARIUM, CALCIUM, COPPER, MANGANESE, STRONTIUM AND TIN; B. RINSING SAID ANODIZED COATING; AND C. CONTACTING SAID ANODIZED COATING WITH A SECOND AQUEOUS SOLUTION OF A SODIUM, POTASSIUM OR AMMONIUM SALT WHICH DISASSOCIATES IN WATER TO FORM AN ANION SELECTED FROM MOLYBDATE, ACID PHOSPHATE, CHROMATE, DICHROMATE, SILICATE AND CHLORATE.
Claim 3
Dependent Claim
51 words
The process of claim 1 wherein said first aqueous solution is maintained within a pH range of about 2 to about 6.5 during contact with said anodized coating and said second aqueous solution is maintained within a pH range of about 2 to about 10 during contact with said anodized coating.
Claim 4
Dependent Claim
27 words
The process of claim 1 wherein said second aqueous solution is maintained at a higher temperature than said first aqueous solution during contact with said anodized coating.
Claim 5
Dependent Claim
27 words
The process of claim 1 wherein said anodized coating iS contacted with said first and second aqueous solutions by immersing said aluminum based article in said solutions.
Claim 6
Dependent Claim
54 words
The process of claim 4 wherein said first aqeuous solution is maintained within a temperature range of about 120*F to about 200*F during immersion therein of said aluminum based article, and said second solution is maintained within a temperature range of about 140*F to about 212*F during immersion therein of said aluminum based article.
Claim 7
Dependent Claim
55 words
The process of claim 5 wherein said first aqueous solution is maintained within a pH range of about 2 to about 6.5 during immersion therein of said aluminum based article and said second aqueous solution is maintained within a pH range of about 2 to about 10 during immersion therein of said aluminum based article.
Claim 8
Dependent Claim
43 words
The process of claim 6 wherein the cation of said first solution is a divalent cation of iron, cobalt or nickel and the anion of the second aqueous solution is selected from the group consisting of molybdate, acid phosphate, silicate, chromate and dichromate.
Claim 9
Dependent Claim
32 words
The process of claim 7 wherein said second aqueous solution is maintained at a higher temperature than said first aqueous solution during immersion of said aluminum based article in the respective solutions.
Claim 10
Dependent Claim
22 words
The process of claim 1 wherein the cation of said first aqueous solution is a divalent cation of iron, cobalt or nickel.
Claim 11
Dependent Claim
27 words
The process of claim 1 wherein the anion of said second aqueous solution is selected from the group consisting of molybdate, acid phosphate, silicate, chromate and dichromate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |